bool invalidMove(int row, int col, char direction) {

  bool invalidLine = true;

  if (!(0<=row && row <=2 )) {
    return true;
  }
  else if (!(0<=col && col <=2 )) {
    return true;
  }
  else if ((direction != 'u') && (direction != 'l') && (direction != 'd') && (direction != 'r')) {
    return true;
  }

  if (row == 0 && direction == 'u')
  return true;
  if (row == 2 && direction == 'd')
  return true;
  if (col == 0 && direction == 'l')
  return true;
  if (col == 2 && direction == 'r')
  return true;

  if (direction == 'u' || direction == 'd') {
    int linerow = row;

  if (direction == 'u')
  --linerow;

  if (grid.vertical(linerow, col) == true)
  invalidLine = false;

  }
  else if (direction == 'l' || direction == 'r') {
    int linecolumn = col;
    if (direction == 'l')
    --linecolumn;

    if(grid.horizontal(row,linecolumn) == true)
    invalidLine = false;

return (!invalidLine);
  }

}